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Doppler physics

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https://www.readbyqxmd.com/read/28729408/femoral-artery-atherosclerosis-is-associated-with-physical-function-across-the-spectrum-of-the-ankle-brachial-index-the-san-diego-population-study
#1
Christina L Wassel, Alicia M Ellis, Natalie C Suder, Emma Barinas-Mitchell, Dena E Rifkin, Nketi I Forbang, Julie O Denenberg, Antoinette M Marasco, Belinda J McQuaide, Nancy S Jenny, Matthew A Allison, Joachim H Ix, Michael H Criqui
BACKGROUND: The ankle-brachial index (ABI) is inadequate to detect early-stage atherosclerotic disease, when interventions to prevent functional decline may be the most effective. We determined associations of femoral artery atherosclerosis with physical functioning, across the spectrum of the ABI, and within the normal ABI range. METHODS AND RESULTS: In 2007-2011, 1103 multiethnic men and women participated in the San Diego Population Study, and completed all components of the summary performance score...
July 20, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28728567/settings-and-artefacts-relevant-for-doppler-ultrasound-in-large-vessel-vasculitis
#2
REVIEW
L Terslev, A P Diamantopoulos, U Møller Døhn, W A Schmidt, S Torp-Pedersen
Ultrasound is used increasingly for diagnosing large vessel vasculitis (LVV). The application of Doppler in LVV is very different from in arthritic conditions. This paper aims to explain the most important Doppler parameters, including spectral Doppler, and how the settings differ from those used in arthritic conditions and provide recommendations for optimal adjustments. This is addressed through relevant Doppler physics, focusing, for example, on the Doppler shift equation and how angle correction ensures correctly displayed blood velocity...
July 20, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28718693/effects-of-sedation-with-dexmedetomidine-and-buprenorphine-on-echocardiographic-variables-blood-pressure-and-heart-rate-in-healthy-cats
#3
Einar Johard, Anna Tidholm, Ingrid Ljungvall, Jens Häggström, Katja Höglund
Objectives Sedative agents are occasionally used to enable echocardiographic examination when screening cats for heart disease, such as hypertrophic cardiomyopathy (HCM). Owing to their haemodynamic effects, sedative agents may alter echocardiographic measurements. The aim of the study was to evaluate the effects of the sedative combination dexmedetomidine and buprenorphine on echocardiographic variables, blood pressure (BP) and heart rate (HR) in healthy cats. Methods Fifty healthy, client-owned cats were prospectively recruited and included after physical examination...
July 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28714381/gemcitabine-associated-pseudocellulitis-a-missed-diagnosis
#4
Dalvir Gill, Josh Schrader, Matthew Kelly, Fidel Martinez, Wajihuddin Syed, Jonathan Wright
We report a case of a 51-year-old male with past medical history significant for cholangiocarcinoma presented with two weeks of worsening bilateral lower extremity swelling and erythema. Patient has been on active chemotherapy for his cholangiocarcinoma with Gemcitabine weekly infusions. Physical exam was significant for bilaterally petechial rash coalescing into ecchymoses over the dorsum of the feet, sparing soles and toes, which dissipated into thinning petechiae more proximally. On labs he did not have any leukocytosis, his platelet count was 50 × 10(3)/µL and basic metabolic panel was benign...
January 1, 2017: Journal of Oncology Pharmacy Practice
https://www.readbyqxmd.com/read/28705754/progression-of-lyme-disease-to-bell-s-palsy-despite-treatment-with-doxycycline
#5
Luis A Marcos, Zengmin Yan
A 54 year-old healthy woman presented to the emergency department with a right sided facial paralysis. About 3 weeks ago, she woke up and noticed an attached engorged tick in her right lower extremity. A week later, she noticed a mild to moderate right jaw pain which progressed to a severe right facial pain so she visited her doctor. On physical, II to XII cranial nerve examination was unremarkable. Doppler ultrasound did not show any vascular abnormalities in temporal artery. Her inflammatory markers were within normal limits (C-reactive protein:0...
July 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28697943/ultrasonographic-characteristics-of-accessory-sex-glands-and-spectral-doppler-indices-of-the-internal-iliac-arteries-in-peri-and-post-pubertal-dorper-rams-raised-in-a-subtropical-climate
#6
E S C Camela, R P Nociti, V J C Santos, B I Macente, G S Maciel, M A R Feliciano, W R R Vicente, I Gill, P M Bartlewski, M E F Oliveira
The aim of the present study was to determine and compare ultrasonographic characteristics of accessory sex glands and spectral Doppler indices of the internal iliac arteries in peri- and post-pubertal rams raised in a subtropical climate. Forty-five Dorper rams were examined (24 rams aged 8-11 months and 21 rams aged 12-24 months). Digital images of all accessory sex glands were subjected to morphometric and echotextural analyses, the latter using commercially available image analytical software Image ProPlus(®)...
June 23, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28679320/a-rare-case-of-non-traumatic-acute-intraabdominal-hemorrhage-ruptured-superior-mesenteric-artery-aneurysm
#7
Ersin Borazan, Latif Yılmaz, Alper Aytekin, Gökhan Gökaslan, Selim Kervancıoğlu
INTRODUCTION: Rupture of superior mesenteric artery aneurysm (SMAA) is a very rare and life-threatening condition, presenting with acute intraabdominal hemorrhage. CASE: The patient was hospitalized upon complaint of nonspecific severe abdominal pain. Diagnosis of SMAA was established by abdominal Doppler ultrasound that showed a pseudo-aneurysmal lesion with size of 76 × 47 mm at the superior mesenteric main branch. Endovascular stenting was not performed because of the wide neck in the segment of the jejunal branches from SMA and the risk of branch loss during treatment...
July 6, 2017: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/28676656/detecting-the-orbital-angular-momentum-of-electro-magnetic-waves-using-virtual-rotational-antenna
#8
Chao Zhang, Lu Ma
Orbital Angular Momentum (OAM) is a typical spatial mode of an Electro-Magnetic (EM) wave. Correctly detecting the OAM mode is fundamental and of foremost importance when applying the phenomenon to wireless transmission in free space. It is found that when rotating an OAM wave, a rotational Doppler shift that is proportional to the rotation speed and the OAM mode number can be observed. This property can be used for OAM detection, i.e., different OAM modes are identified by measuring the corresponding rotational Doppler frequency shifts...
July 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28663159/synchronous-solid-pseudopapillary-tumor-and-insulinoma-in-an-adolescent-men1-patient-presenting-with-diagnostic-dilemmas
#9
Ahmet Uçar, Banu Özgüven, Muharrem Battal, Felda Alpaslan, Evrim Özmen, Aylin Yetim, Yasin Yılmaz
Multiple endocrine neoplasia (MEN1) is a rare autosomal dominant disorder characterized by primary hyperparathyroidism, enteropancreatic neuroendocrine tumors, and anterior pituitary adenomas. A 16-year-old male presented to the emergency outpatient clinic with tonic convulsions. Physical examination in the postconvulsive period was unremarkable and revealed a muscular, postpubertal adolescent. Biochemical tests at admission were consistent with hyperinsulinemic hypoglycemia and remarkable for elevated levels of liver transaminases and creatine kinase...
June 30, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/28647634/more-successful-results-with-less-energy-in-endovenous-laser-ablation-treatment-long-term-comparison-of-bare-tip-fiber980nm-laser-and-radial-tip-fiber1470nm-laser-application
#10
Ümit Arslan, Eyüpserhat Çalık, Mehmet Tort, Ziya Yıldız, Ali İhsan Tekin, Hüsnü Kamil Limandal, Mehmet Ali Kaygın, Özgür Dağ, Bilgehan Erkut
BACKGROUND: Varices and venous insufficiency are common and serious health problems in the general population which affect quality of life. Endothermal treatment of the great saphenous vein has become the first line of treatment for superficial venous reflux, and the endovenous laser ablation (EVLA) method has been widely accepted all over the world. In this method, ablation is provided by a laser fiber inserted into the lumen of the vein. Initially, the fibers were 810 nm, but today the fibers are usually 940, 980, or 1470 nm...
June 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28637734/pregnancy-specific-stress-fetoplacental-haemodynamics-and-neonatal-outcomes-in-women-with-small-for-gestational-age-pregnancies-a-secondary-analysis-of-the-multicentre-prospective-observational-trial-to-optimise-paediatric-health-in-intrauterine-growth-restriction
#11
Terri A Levine, Ruth E Grunau, Ricardo Segurado, Sean Daly, Michael P Geary, Mairead M Kennelly, Keelin O'Donoghue, Alyson Hunter, John J Morrison, Gerard Burke, Patrick Dicker, Elizabeth C Tully, Fergal D Malone, Fiona A Alderdice, Fionnuala M McAuliffe
OBJECTIVES: To examine associations between maternal pregnancy-specific stress and umbilical (UA PI) and middle cerebral artery pulsatility indices (MCA PI), cerebroplacental ratio, absent end diastolic flow (AEDF), birthweight, prematurity, neonatal intensive care unit admission and adverse obstetric outcomes in women with small for gestational age pregnancies. It was hypothesised that maternal pregnancy-specific stress would be associated with fetoplacental haemodynamics and neonatal outcomes...
June 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28636515/a-brief-period-of-intensive-cardiac-rehabilitation-improves-global-longitudinal-strain-and-diastolic-function-after-a-first-uncomplicated-myocardial-infarction
#12
Gabriella Malfatto, Miriam Revera, Giovanna Branzi, Francesca Ciambellotti, Alessia Giglio, Simonetta Blengino, Matteo Oldani, Camilla Facchini, Gianfranco Parati, Mario Facchini
Objectives In patients with abnormal left ventricular ejection fraction (LVEF) after acute myocardial infarction (AMI), cardiac rehabilitation with physical training prevents cardiac remodelling. To define the role of rehabilitation in the recovery of ventricular function in less severe cases, we studied its effects on more refined indexes of left ventricular function in uncomplicated, low-risk patients. Methods and results Fifty-five patients underwent percutaneous coronary revascularization after uncomplicated first AMI...
March 21, 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28599229/round-ligament-varicosities-diagnosed-as-inguinal-hernia-during-pregnancy-a-case-report-and-series-from-two-regional-hospitals-in-japan
#13
Yuka Mine, Susumu Eguchi, Akihito Enjouji, Masayoshi Fukuda, Junzo Yamaguchi, Yusuke Inoue, Fumihiko Fujita, Ohzora Tsukamoto, Hideaki Masuzaki
INTRODUCTION: Round ligament varicosities (RLV) are not well-known and they are usually caused by pregnancy. Although the groin swelling of RLV mimics an inguinal hernia, it is difficult to distinguish between them through clinical examination alone, and there have been few published reports on this topic, especially from Asia. CASE PRESENTATION: A 37-year-old Japanese woman complained of left groin swelling for 2 weeks at her 28th week of gestation of her first pregnancy...
2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28598874/transverse-split-sternotomy-a-mini-invasive-approach-for-repair-of-congenital-cardiac-defects
#14
Pankaj Garg, Arvind Kumar Bishnoi, Kartik Patel, Chandrashekaran Annanthnarayan, Jigar Patel, Malkesh Talsariya, Komal Shah, Sanjay Patel
OBJECTIVE: In this article, we aim to review our mini-invasive technique of transverse sternal split (TSS) with or without cervical cannulation for cardiopulmonary bypass (CPB), its usefulness, and efficiency for repair of congenital cardiac defects. METHODS: Between January 2013 and June 2015, 34 infants and small children were operated through TSS in third or fourth intercostal space [Tetralogy of Fallot 11, perventricular ventricular septal defect (VSD) device closure 23]...
June 8, 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/28598374/doppler-navigation-system-with-a-non-stabilized-antenna-as-a-sea-surface-wind-sensor
#15
Alexey Nekrasov, Alena Khachaturian, Vladimir Veremyev, Mikhail Bogachev
We propose a concept of the utilization of an aircraft Doppler Navigation System (DNS) as a sea-surface wind sensor complementary to its normal functionality. The DNS with an antenna, which is non-stabilized physically to the local horizontal with x-configured beams, is considered. We consider the wind measurements by the DNS configured in the multi-beam scatterometer mode for a rectilinear flight scenario. The system feasibility and the efficiency of the proposed wind algorithm retrieval are supported by computer simulations...
June 9, 2017: Sensors
https://www.readbyqxmd.com/read/28582335/a-prospective-clinical-trial-comparing-visible-light-spectroscopy-to-handheld-doppler-for-postoperative-free-tissue-transfer-monitoring
#16
Alexander F Mericli, James Wren, Patrick B Garvey, Jun Liu, Charles E Butler, Jesse C Selber
BACKGROUND: Early detection of compromised free flap perfusion is critical. A common modality of thrombosis detection, physical exam augmented with hand-held Doppler, only provides intermittent data and is insensitive to venous compromise. Visible light spectroscopy (VLS) provides continuous, non-invasive evaluation of tissue perfusion. We hypothesized that VLS is a more sensitive and specific monitoring method for early detection of post-operative flap compromise than intermittent, hand-held Doppler and clinical exam...
June 1, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28581366/flat-head-positioning-increases-cerebral-blood-flow-in-anterior-circulation-acute-ischemic-stroke-a-cluster-randomized-phase-iib-trial
#17
Verónica V Olavarría, Pablo M Lavados, Paula Muñoz-Venturelli, Francisca González, Javier Gaete, Sheila Martins, Hisatomi Arima, Craig S Anderson, Alejandro M Brunser
Background Whether lying-flat improves blood flow in patients with acute ischemic stroke is unknown. Our aim was to investigate if lying-flat "changes" cerebral blood flow velocities assessed by transcranial Doppler in acute ischemic stroke patients. Methods In a multicenter cluster clinical trial, we randomly assigned patients within 12 h from onset of a neurological deficit due to cerebral ischemia of the anterior circulation to lying-flat or upright head positioning. The primary outcome was a change of 8 cm/s or more in mean cerebral blood flow velocities on transcranial Doppler to the middle cerebral artery at 1 and 24 h post-randomization, adjusted for imbalance in baseline variables...
January 1, 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28571941/clinical-predictors-of-isolated-tubal-torsion-a-case-series
#18
K W Webster, S M Scott, P S Huguelet
STUDY OBJECTIVE: A rare cause of adolescent abdominal pain includes isolated tubal torsion (ITT). Presentation is nonspecific and few studies have investigated adolescents. Our study objective is to describe the presentation and management of ITT in a large case series. DESIGN: Retrospective observational case series. SETTING: Tertiary care children's hospital. PARTICIPANTS: Females aged 3-21, presenting to Children's Hospital Colorado and diagnosed with ITT between January 2004 and August 2015...
May 29, 2017: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/28570718/free-flap-reconstruction-monitoring-techniques-and-frequency-in-the-era-of-restricted-resident-work-hours
#19
Urjeet A Patel, David Hernandez, Yelizaveta Shnayder, Mark K Wax, Matthew M Hanasono, Joshua Hornig, Tamer A Ghanem, Matthew Old, Ryan S Jackson, Levi G Ledgerwood, Patrik Pipkorn, Lawrence Lin, Adrian Ong, Joshua B Greene, James Bekeny, Yin Yiu, Salem Noureldine, David X Li, Joel Fontanarosa, Evan Greenbaum, Jeremy M Richmon
Importance: Free flap reconstruction of the head and neck is routinely performed with success rates around 94% to 99% at most institutions. Despite experience and meticulous technique, there is a small but recognized risk of partial or total flap loss in the postoperative setting. Historically, most microvascular surgeons involve resident house staff in flap monitoring protocols, and programs relied heavily on in-house resident physicians to assure timely intervention for compromised flaps...
June 1, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28557070/color-and-power-doppler-sonography-for-pneumothorax-detection
#20
John R Richards, Julianne M Awrey, Sarah E Medeiros, John P McGahan
The use of B- and M-mode sonography for detection of pneumothorax has been well described and studied. It is now widely incorporated by sonographers, emergency physicians, trauma surgeons, radiologists, and critical care specialists worldwide. Lung sonography can be performed rapidly at the bedside or in the prehospital setting. It is more sensitive, specific, and accurate than plain chest radiography. The use of color and power Doppler sonography as an adjunct to B- and M-mode imaging for detection of pneumothorax has been described in a small number of studies and case reports but is much less widely known or used...
May 30, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
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